In a short observation time, after the range alignment and phase adjustment, motion of target can be approximated as uniform rotation. The radar observing process simply described multiplying an matrix on ISAR image, which thought linear system. It is known that longer time is, higher cross-range resolution is. order to deal with conflict between high resolution, we introduce Kalman filtering (...

In order to reduce the quantization noise of low-resolution DAC, we study a shaping technique that can reshape white an irregular spectrum, in which data subcarrier band is almost transformed into null band. Both simulation and experiment, verify effectiveness investigated scheme 25 GHz 16-QAM/32-QAM/64-QAM DMT transmission systems. The experimental results show enhance receiver sensitivity 4-b...

Finite-resolution digital receiver is considered to be a potential solution to meet the severe demand of ADC that results from wideband of IR-UWB signal. However, the quantized distortion is totally different from full-resolution quantized signal. In this paper, the finite-resolution quantized signal model is derived. Based on the correlation receiver, estimation and detection performance of fi...

in recent years, wavelet packet modulation ofdm (wpm-ofdm) signals have been introduced for radar applications. these signals have important properties such as inherent high range resolution and high resistance of radar system against jamming reception. this paper investigates the problem of designing these family of signals according to the following criteria: constrained maximization of the d...

Photoacoustic microscopy has achieved submicron lateral resolution, but its axial resolution is much lower. Here an axial resolution of 7.6 μm, the highest axial resolution validated by experimental data, has been achieved by using a commercial 125 MHz ultrasonic transducer for signal detection followed by the Wiener deconvolution for signal processing. Limited by the working distance, the high...

This article presents a phased array antenna employing MEMS phase shifter. The proposed phased array antenna consists of eight square patch antennas operating at 10.4 GHz with a bandwidth of 400 MHz. Feed line for each patch passes through a MEMS phase shifter realized by a series of bridges above the transmission line. The distance between the bridge and the transmission line underneath it is ...

Today's computer animators have access to many systems and techniques to author high quality motion. Unfortunately, available techniques typically produce a particular motion for a specific character. In this paper, we present a constraintbased approach to adapt previously created motions to new situations and characters. We combine constraint methods that compute changes to motion to meet spec...

Introduction Echo-planar imaging (EPI) is a group of fast data acquisition methods commonly used in fMRI studies. It acquires multiple image lines in k-space after a single excitation, which leads to a very short scan time. A well-known problem with EPI is that it is more sensitive to distortions due to the used encoding scheme. Source of distortion is inhomogeneity in the static B0 field that ...